西安法华寺黄土崩塌形成—运动机理研究
[Abstract]:The harm of loess collapse is well known, but effective prevention and cure is always very difficult, the key bottleneck is its mechanism. In order to solve this problem, it is proposed to study the whole process of disaster inoculation, development, deformation and destruction, and discuss quantitatively the formation-movement mechanism of loess collapse disaster. For the prevention and control of loess collapse, the following four main research results are obtained: (1) aiming at the loess collapse in Fahusi, the internal and external factors affecting the collapse are put forward. Internal causes include slope shape, slope structure and vegetation. The external causes include rainfall action, earthquake action and engineering activities, which lay a foundation for the study of the collapse mechanism of the Loess in the Fahua Temple. (2) three kinds of formation mechanisms are put forward for the collapse of the Loess in Fahashi. 1 the formation mechanism of collapse in the rainstorm state: Rain Water infiltration, Enrichment-fracture expansion, water filling-fracture surface infiltration, 2 formation mechanism of earthquake state collapse: seismic force action-soil shear disintegration-obtaining initial velocity-generating migration-occurrence of collapse. 3 formation mechanism of engineering active state collapse: engineering activity Action-failure stress balance-rainfall or vibration-fracture surface transfixion-collapse. (3) the movement mechanism of "deformation-toppling-falling-stacking" of Loess collapse in Fahua Temple is put forward. The characteristics of collapse body in each stage are explained. 1 the deformation stage of fracture in the rear edge: under the action of gravity, top building and other external forces, uneven settlement occurs on the top of the slope, resulting in tensile fissure. 2 the collapse stage: when the crack is filled with water, The rapid increase of hydrostatic pressure results in a sharp increase in the sliding torque, and the collapse body collapses at the bottom of the fracture surface. 3 falling stage: after the collapse body center of gravity is moved out of the slope, the collapse body falls down from the parent body. The process is oblique throwing movement. 4 stacking stage: after falling, the collapse will cause harm to the ground. The equations of motion of each stage are established. (4) based on the understanding of the movement process of the loess collapse disaster in Fahusi, the geological model of the collapse body is established. With the help of discrete element program, the whole process of deformation, toppling, falling and accumulation of collapse body is numerically simulated, and the simulation value of the influence range of collapse body in heavy rain state and storm earthquake state is determined. The simulated values of the influence range of the collapses in the torrential rain state are close to the theoretical values of the influence range, and the actual values are close to those of the theoretical values.
【学位授予单位】:西安科技大学
【学位级别】:硕士
【学位授予年份】:2017
【分类号】:P642.21
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